Serial Communication In Atmega 16

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SERIAL COMMUNICATION IN ATMEGA 16 Suren Kumar @ embedautomation.com

Lets get started Wiki:- S erial Port is a serial communication physical interface through which information transfers in...

Basics of Serial Communication <ul><li>Computers transfer data in two ways: parallel and serial. </li></ul><ul><li>In para...

Shift Registers <ul><li>In digital circuits, a shift register is a group of flip flops set up in a linear fashion which ...

Modem <ul><li>Modem (from modulator-demodulator) is a device that modulates an analog carrier signal to encode digital inf...

Synchronous and Asynchronous <ul><li>Synchronous serial communications </li></ul><ul><li>- The clocks of the sender and re...

Serial Communication Terminology <ul><li>Baud rate: the number of bits sent per second (bps). Baud rate is the number of s...

Data Framing Example

Pin Out of Serial Port

Serial Communication in ATMEGA 16 <ul><li>ATmega16 provides three subsystems for serial communications. </li></ul><ul><li>...

Serial Communication in ATMEGA 16 <ul><li>Max 232:- As we know for serial port we require TIA/EIA-232-F voltage level i.e...

Schematic of ATMEGA 16 with Serial Port

Serial USART – An Overview <ul><li>USART of the ATmega16 supports </li></ul><ul><li>- baud rates from 960bps up to 57.6kbp...

Block Diagram of USART - Datasheet

Serial USART – Hardware Elements <ul><li>USART Clock Generator: </li></ul><ul><li>- to provide clock source. </li></ul><ul...

USART Baud Rate Registers The UBRRH Register shares the same I/O location as the UCSRC Register. See the “Accessing UBRRH/...

USART Baud Rate Registers Example: Find UBRR registers for baud rate of 1200bps, assuming system clock is 1MHz. Ans: UBRR ...

USART Control & Status Register A <ul><li>Read the registers USCRA,USCRB,USCRC from the DataSheet. There is no substitute...

USART Data Register <ul><li>Register UDR is the buffer for characters sent or received through the serial port. </li></ul>...

Serial USART – Main Tasks <ul><li>Initializing the serial port. </li></ul><ul><li>Sending a character. </li></ul><ul><li>R...

Initializing Serial Port <ul><li>Set USART communication parameter (data bit, stop bit, parity bit) </li></ul><ul><li>Enab...

Initializing Serial Port - Example <ul><li>Initialize serial port of ATmega16 to baud rate 1200, no parity, 1 stop bit, 8 ...

Sending a character <ul><li>Has UDRE flag been set to 1? (Register UCSRA) </li></ul><ul><li>Write the character to registe...

Receiving a Character <ul><li>Has RXC flag been set to 1? (Register USCRA) </li></ul><ul><li>Read the received character ...

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